These packs are wrapped in a cellophane wrapper rather than the traditional wax wrapper. In 1983 Topps tried out this new product in a test run, in limited quantities, and released it in the Michigan area, hence the term "Michigan Test".
36 packs per box, 15 cards per pack
Ryne Sandberg, Tony Gwynn, Wade Boggs
BBCE - Box has been authenticated by Baseball Card Exchange